Transmitter-mouthpiece.



E. C. G. MUELLER.

TRANSMITTER MOUTHPIECE.

APPLICATION FILED APR. 29. 1915.

1,242,022. Patented Oct. 2, 1917.

//7 van/0r: fm/Y 6.6. Maw/er.

I are perspective views of the attaching ring;

WITED STATES PATENT orrron.

EMIL' C. G. MUELLER, 0F ELIZABETH, NEW J'ERSEY, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

rnnnsiurrrnn-mournrmon.

Specification of Letters Patent.

Patented Oct. 2, 1917.

Application filed April 29, 1915. Serial No. 24,799.

To all whom it may concern.-

Be it known that I, Emu, CHARLESYGUS-V 'mv MUELLER, a citizen of the United States,

residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new-and useful Improvements in Transmitter-Mouthpieces, of which the following made of porcelain or other similar material, f

and an attaching ring secured in any suitable manner to one end thereof, said ring being provided with prongs adapted to engage projections formed integral with said body portion. Radially disposed soundo enings or vents are molded in the edge 0 the end carrying the attaching ring, said vents coincidin with the spaces between the prongs o the attaching rin to furnish air passages into the sound 0' amber of the transmitter without the necessity of any drilling operation.

This invention is illustrated in the accompanying drawing in which Figure-1 1s a sectional view of a mouth iece embodying the features of this inventlon; Figs. 2 and 5 Fig. 3 is a perspective view of the mouthpiece shown in Fig. 1; Fig. 4 is a sectional view of a modified form; and Fig. 6 1s a perspective view of the modified form shown in Fig. 4.

A'mouthpiece made in accordance with the invention comprises the usual flaring bell shaped body portion, which is preferably molded from porcelain and provlded with the usual perforated partition or grid 2 adjacent the small end thereof. A substantially annular channel 3 is molded in the edge portion of the inner or small end of the mouthpiece. Lugs or projections 4 located in the annulus are provided with radially disposed openings or vents 5 molded therein, ich feature will be more fully describedhereinafter. In order to removably ing ring 6. A portion 7 of the exterior of this ferrule is of reduced diameter to form a shoulder or abutment 8 and the entire outer surface is threaded. The reduced portlon 7 is bifurcated and the two resulting prongs are adapted toengage the lugs or projections 4, and, when the ring or ferrule 6 is secured in position, the interdivisional spaces in the portion 7 coincide with the openings 5 in the end of the body portion to form air relief passages communicating with the sound chamber of the transmitter. This arrangement eliminates the necessity of any drilling operation in providing vents either before or after assembly of the elements 1 and 6, which materially reduces the portion 7 of the ring 6, and then said ring is inserted into the channel 3 with the spaces between the prongs of portion 7 registering with the openings 5, in which position the shoulder or abutment 8 is in contact with the end of body portion. The binder is allowed to harden, thus securing the ring 6 firmly in position. The screwthreads formed upon the reduced portion 7 function as a means for more rigidly holding the ring in place b virtue of the cement engaging said threa s when in a plastic condition and afterward setting. The engagement of projections 4 with the two rongs of the reduced portion 7 prevents rel of the body portion 1'and the:: ring 6 in event the cement becomes loosened. The axial length of the ring 6 is greater than the depth of the recess 3 and whensaid ring is afiixed to the body portion -1, with the shoulder 8 abutting against the end of the said bod portion, a portion of said ring will IOjGOt beyond the inner edge of the 'mout piece, which afiords means for attachingthe mouthpiece to'the transmitter. When transmitter when said transmitter is actuative rotation ated. Fi 4 and 6 show a modified form of the mout piece contemplated by this invention. In this modified form the annular channel 3 is eliminated, leaving the rojections 4 standing out prominent y. e shoulder 8 of the ring 6 abuts against the end of the body portion 1 and provides a seating surface for the ring 6. In other respects, this moditied mouthpiece is similar to the one described above,

From the above, it will be apparent that a mouthpiece embodying the features oi this invention will be simple in structure and cheap to manufacture.

What is claimed is:

31.. in a telephone mouthpiece, a body portion, a tubular metallic attaching means therefor having a plurality of projecting members, a base for said body portion provided with a plurality of recesses corresponding in number to the number of said projecting members, and into which said members may be inserted, means on said base intermediate said recesses and cooperating with said members to prevent relative rotation of said body portion and said atmeans, said base also being provided with r vents extending laterally -thereintermediate said recesses, and

means for securing said attaching means to said body portion.

ing with said projecting members to prevent relative rotation of said body portion and said attaching means, said base also being provided with air vents extending iateraily therethrough intermediate said recesses, an annular abutment on said attaching means against which the base of said body portion rests, and means for securing said attaching means to said body portion.

In Witness whereof, hereunto subscribe my name this 28th day of Ap l EBA-ILL G. 

